Help please ! New user, really slow rendering is my computer just not powerful enough!

Hi guys

ive recently purchased premiere pro and yes my laptop is a 2017 Mac book air - I have mainly edited on I movie to the max of its ability and can do everything in real time (effects, graphics etc) and playback is speedy. Been messing around with some footage and lowered all the resolutions to 1/4 and done the GPU trick and still when I put in a literal 3 second graphic onto the timeline it's super laggy to the point where I can't edit at all - then it takes about 25 mins to render that tiny effect...

is my system just to bad ? Shall I do a software update ? Is there anything else I can try 

many thanks 

V

system requirements 

processor : 1.8ghz intel core 5 

memory: 8gb 1600 MHz DDR3

grpahics : intel hd graphics 6000 1536mb